Watch a replay of the Delta 4 NROL-47 launch

The mobile platform intended to carry NASA’s Space Launch System will trek to the mega-rocket’s launch pad at the Kennedy Space Center in Florida as soon as Thursday, before heading inside the spaceport’s huge Vehicle Assembly Building for the first time next month.

SpaceX called off the planned launch of a Falcon 9 rocket Friday at Cape Canaveral, halting the countdown less than a minute before liftoff to allow time to perform additional ground system checkouts before the mission’s next launch opportunity no earlier than Sunday.

The Falcon 9 rocket and Crew Dragon capsule climb the ramp to pad 39A at the Kennedy Space Center ahead of next week’s crew launch in this time-lapse video.